A wind with speed $40 \mathrm{m} {\mathrm{s}}^{-1}$ blows parallel to the roof of a house. The area of the roof is $250\mathrm{ }{\mathrm{m}}^2$ . Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the direction of the force will be : $\left({\rho }_{\mathrm{air} }=1.2 \mathrm{kg} {\mathrm{m}}^{-3}\right)$$$

• A

  $4.8\times {10}^5$ N, downwards
• B

  $4.8\times {10}^5$ N, upwards
• Correct answer
  C

  $2.4\times {10}^5$ N, upwards
• D

  $2.4\times {10}^5$ N, downwards

Hence, the correct answer is option: 'C'.